Mary-Kate Olsen and Ashley Olsen enjoyed a chic sibling date night during New York Fashion Week. Mary-Kate and Ashley, both 39, stepped out in style at W magazine and Bloomingdale's NYFW cocktail reception on Thursday, September 11, held at Eleven Madison Park in Manhattan. Mary-Kate wore a gray blouse over a pair of black trousers, which accentuated her multicolored, pattern scarf around her shoulders. Ashley, for her part, opted for a pair of jeans with an oversized black coat and a pale green scarf wrapped around her neck.